Thanks everyone,
Getting the old one out was a real struggle. Taps did not do the job. Finally got it to move a little and had to keep on banging. It seems that this one had never been out. I had the engine out and had some one rebuild it 7 years ago. It seems that pulling these and replacing then would have been the right thing to do.
As for crud, I would say CRUD. WOW. Loosened, vacumed, and flushed out quite a lot.

It's running!!! I took it around the neiborhood and I'm off to get plates.

Thanks again.